standard grading
2.The professional standard SY/5059 subsruface pumps gives the method Of clearance grading for both integral barrel and combined subsurface pumps,but there is acme overlap between the adjacent clearance grades for integral barrel pumps and some diversity between the grade values of the two hos of pumps.
4.According to the “Regional Environment Noise Standard”(GB 3096-93)which was published by the national EPB in 1993,noise environment assessments of different function areas in Tai An have been done by the grading model. By comparing the standard with the real data,the noise environment quality classification has been defined in view of different function areas.
7.The inspection of qualifications of constructors must be toughened and grading of the constructors should be strictly controlled. Unqualified and low-standard constructors must be forbidden to undertake the construction that beyond their qualifications.
10.On the basis of the predecessors, research, this paper sudies the mountainous river in the apsects of the waterway, afflux, sediment transport and grading characteristics The idea of the relative average difference of the basin height and of the rising amplitude of the unit flow per unit time are raised and used as a standard to distinguish different types of rivers.
